- Based on busybox
- Use a very small footprint
- Install Apache Tomcat 8 basic distribution
- Samples and Tricks
- Composition
- Overlay JRE with JDK
- Overwrite or extend Tomcat configs, webapps or libs
This source is the sample from my german blog post.
Create the images with ./build.sh
$ ./build.sh
$ docker images | grep "infrabricks/ex-"
infrabricks/ex-status latest 1c267a744c50 18 seconds ago 4.82 MB
infrabricks/ex-java jdk-8 6a16ac13d19f 5 minutes ago 331.3 MB
infrabricks/ex-tomcat 8-volume 8b11401ffa83 12 minutes ago 15.49 MB
infrabricks/ex-tomcat 8 aa91560e2d92 15 minutes ago 171 MB
infrabricks/ex-java jre-8 ff8342ad2463 41 minutes ago 160.3 MB
You see that the java images sizes are very small!
Information about the installed tomcat version:
$ docker run --rm --entrypoint=/opt/tomcat/bin/version.sh infrabricks/ex-tomcat:8
Server version: Apache Tomcat/8.0.15
Server built: Nov 2 2014 19:25:20 UTC
Server number: 8.0.15.0
OS Name: Linux
OS Version: 3.16.7-tinycore64
Architecture: amd64
JVM Version: 1.8.0_25-b17
JVM Vendor: Oracle Corporation
heisenberg:docker-simple-tomcat8 peter$$ mkdir -p webapps/status
$ cd status/webapp
$ vi index.jsp
...
$ zip -r ../status.war .
$ cd ..
$ CID=$(docker run -d -p 8002:8080 -v `pwd`/status/webapp:/opt/tomcat/webapps/status infrabricks/ex-tomcat:8)
$ docker logs $CID
18-Dec-2014 16:39:20.610 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Server version: Apache Tomcat/8.0.15
18-Dec-2014 16:39:20.612 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Server built: Nov 2 2014 19:25:20 UTC
18-Dec-2014 16:39:20.612 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Server number: 8.0.15.0
18-Dec-2014 16:39:20.612 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log OS Name: Linux
18-Dec-2014 16:39:20.612 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log OS Version: 3.16.7-tinycore64
18-Dec-2014 16:39:20.612 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Architecture: amd64
18-Dec-2014 16:39:20.612 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log JAVA_HOME: /opt/jdk1.8.0_25/jre
18-Dec-2014 16:39:20.612 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log JVM Version: 1.8.0_25-b17
18-Dec-2014 16:39:20.612 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log JVM Vendor: Oracle Corporation
18-Dec-2014 16:39:20.612 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log CATALINA_BASE: /opt/tomcat
18-Dec-2014 16:39:20.612 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log CATALINA_HOME: /opt/tomcat
18-Dec-2014 16:39:20.613 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djava.util.logging.config.file=/opt/tomcat/conf/logging.properties
18-Dec-2014 16:39:20.613 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
18-Dec-2014 16:39:20.613 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djava.endorsed.dirs=/opt/tomcat/endorsed
18-Dec-2014 16:39:20.613 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dcatalina.base=/opt/tomcat
18-Dec-2014 16:39:20.613 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dcatalina.home=/opt/tomcat
18-Dec-2014 16:39:20.613 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djava.io.tmpdir=/opt/tomcat/temp
18-Dec-2014 16:39:20.613 INFO [main] org.apache.catalina.core.AprLifecycleListener.lifecycleEvent The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: /usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib
18-Dec-2014 16:39:20.789 INFO [main] org.apache.coyote.AbstractProtocol.init Initializing ProtocolHandler ["http-nio-8080"]
18-Dec-2014 16:39:20.811 INFO [main] org.apache.tomcat.util.net.NioSelectorPool.getSharedSelector Using a shared selector for servlet write/read
18-Dec-2014 16:39:20.815 INFO [main] org.apache.coyote.AbstractProtocol.init Initializing ProtocolHandler ["ajp-nio-8009"]
18-Dec-2014 16:39:20.817 INFO [main] org.apache.tomcat.util.net.NioSelectorPool.getSharedSelector Using a shared selector for servlet write/read
18-Dec-2014 16:39:20.819 INFO [main] org.apache.catalina.startup.Catalina.load Initialization processed in 702 ms
18-Dec-2014 16:39:20.847 INFO [main] org.apache.catalina.core.StandardService.startInternal Starting service Catalina
18-Dec-2014 16:39:20.847 INFO [main] org.apache.catalina.core.StandardEngine.startInternal Starting Servlet Engine: Apache Tomcat/8.0.15
18-Dec-2014 16:39:20.863 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory /opt/tomcat/webapps/status.war
18-Dec-2014 16:39:21.584 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory /opt/tomcat/webapps/status.war has finished in 720 ms
18-Dec-2014 16:39:21.585 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory /opt/tomcat/webapps/manager
18-Dec-2014 16:39:21.630 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory /opt/tomcat/webapps/manager has finished in 44 ms
18-Dec-2014 16:39:21.636 INFO [main] org.apache.coyote.AbstractProtocol.start Starting ProtocolHandler ["http-nio-8080"]
18-Dec-2014 16:39:21.647 INFO [main] org.apache.coyote.AbstractProtocol.start Starting ProtocolHandler ["ajp-nio-8009"]
18-Dec-2014 16:39:21.649 INFO [main] org.apache.catalina.startup.Catalina.start Server startup in 829 ms$ IP=$(docker inspect --format '{{ .NetworkSettings.IPAddress }}' ${CID})
$ echo $IP
172.17.0.71
$ curl -s http://$IP:8080/status/index.jsp
<html>
<body>
<h1>Docker Tomcat Status page</h1>
<ul>
<li>Hostname : 902079cacbc0</li>
<li>Tomcat Version : Apache Tomcat/8.0.15</li>
<li>Servlet Specification Version : 3.1</li>
<li>JSP version : 2.3</li>
<li>Now : 2014/12/18 16:45:25</li>
</ul>
</body>
</html
$ docker run --name jdk8 infrabricks/ex-java:jdk-8
$ docker run -d -p 8002:8080 \
--volumes-from jdk8 \
-v `pwd`/status/webapp:/opt/tomcat/webapps/status \
infrabricks/ex-tomcat:8
$ CID=$(docker ps -lq)
$ docker exec $CID jps
1 Bootstrap
49 Jps
$ docker exec $CID jstat -gc 1 5000
S0C S1C S0U S1U EC EU OC OU MC MU CCSC CCSU YGC YGCT FGC FGCT GCT
1024.0 1024.0 0.0 992.0 17408.0 10440.2 22016.0 8928.4 13056.0 12628.3 1536.0 1391.4 3 0.037 0 0.000 0.037
1024.0 1024.0 0.0 992.0 17408.0 10440.2 22016.0 8928.4 13056.0 12628.3 1536.0 1391.4 3 0.037 0 0.000 0.037
CTRL-C
$ docker exec -ti $CID /bin/sh
...Now debugging is really easy possible, but without building a new tomcat development image!
tomcat-users.xml
<?xml version='1.0' encoding='utf-8'?>
<<tomcat-users xmlns="http://tomcat.apache.org/xml"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://tomcat.apache.org/xml tomcat-users.xsd"
version="1.0">
<role rolename="manager-script"/>
<user username="manager" password="tomcat" roles="manager-script"/>
</tomcat-users>$ docker run -d -p 8002:8080 \
-v `pwd`/status/webapp:/opt/tomcat/webapps/status \
-v `pwd`/tomcat8:/opt/bootstrap \
--entrypoint=/opt/bootstrap/bin/tomcat.sh \
infrabricks/ex-tomcat:8
$ CID=$(docker ps -lq)
$ docker logs $CID
Checking *.war in /opt/bootstrap/webapps
Checking tomcat extended libs *.jar in /opt/bootstrap/lib
Checking tomcat conf files in /opt/bootstrap/conf
Linking /opt/bootstrap/conf/tomcat-users.xml --> /opt/tomcat/conf/tomcat-users.xml
18-Dec-2014 17:45:18.678 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Server version: Apache Tomcat/8.0.15
18-Dec-2014 17:45:18.681 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Server built: Nov 2 2014 19:25:20 UTC
18-Dec-2014 17:45:18.682 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Server number: 8.0.15.0
18-Dec-2014 17:45:18.683 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log OS Name: Linux
18-Dec-2014 17:45:18.683 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log OS Version: 3.16.7-tinycore64
18-Dec-2014 17:45:18.687 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Architecture: amd64
...
$ IP=$(docker inspect --format '{{ .NetworkSettings.IPAddress }}' ${CID})
$ curl -su manager:tomcat http://$IP:8080/manager/text/list
OK - Listed applications for virtual host localhost
/status:running:0:status
/manager:running:0:managerENV DEBIAN_FRONTEND noninteractive
ENV LD_LIBRARY_PATH ${LD_LIBRARY_PATH}:/usr/lib/x86_64-linux-gnu/
RUN apt-get update
RUN apt-get install -y libtcnative-1
- Tomcat tcnative documentation
- install openssl and apr
- Build newest version?
See my infrabricks blog to more informations.
Contact me: Peter peter.rossbach@bee42.com
Follow me on Twitter
If you have any problems with or questions about this image, please contact us through a GitHub issue.
You are invited to contribute new features, fixes, or updates, large or small; we are always thrilled to receive pull requests, and do our best to process them as fast as we can.
Before you start to code, we recommend discussing your plans through a GitHub issue, especially for more ambitious contributions. This gives other contributors a chance to point you in the right direction, give you feedback on your design, and help you find out if someone else is working on the same thing.